Category Archives: News

Accessories, News

3D printed side rails and cover for the Venus SW-3B

13 Comments

Many thanks to Rick (K8BMA) who writes:

I’ve had a SW-3B for a couple of years now. Even use it in the ham shack.

I also have a KX2. From packing the KX2 around, I have noticed problems with the main tuning encoder, probably from having weight up against it. I pack it in one of the bags they sell.

Recently, I came across 3D printed end plates, cover and, STL files for the SW-3B. My son, a packaging engineer printed off a set of these parts at work for me.

Just what you need for yours. I also found a similar cover for the KX2. Next on my list.

Enjoy your posts.

73, Rick K8BMA

Thank you so much for sharing this, Rick! I believe you printed KN6EZE’s side panels and cover that are available on Thingiverse. I am definitely planning to print some of these as well. One reader noted that the encoder is a bit of a weak point on the SW-3B and it should be protected in transport if possible. 

I’ve been thinking about grabbing some KX2 side rails and Lexan cover from this company. Then again, I reckon I could also simply print some!

Thank you for the tip!

Antennas, Field Reports, News, Portable, QRP

QRP POTA at Fort Dobbs: No antenna? No problem!

15 Comments

I’m a pretty organized field radio guy if I do say so myself.

In all of the hundreds of field activations I’ve attempted since the days of the National Parks On The Air (NPOTA) program, I’ve only arrived on site two or three times and discovered I was missing a key component of my field kit.  Out of those times, only once do I remember that the missing component prevented my activation (it was hard to power my radio without a battery and power cable). The other times, I was able to improvise.

As I mentioned in this two-parter series, I tend to build two different types of field kits:

  • one that’s fully self-contained (like the MTR-3B kit),
  • or one that’s modular, where component families (transceiver, antenna, power, etc) are in their own packs and can be moved from pack to pack.

I always prefer having dedicated field kits, but they’re pricey because they require a dedicated antenna, battery, radio, key/mic, earphones, pack, connectors, and sometimes even their own throw line.

I assemble modular kits around a particular radio and antenna system prior to leaving the QTH to go on an activation. I have a method for doing this which prevents me from leaving stuff behind.

Save this time…

On Thursday, April 7, 2022, before leaving the house for a quick overnight trip, I grabbed my SOTA pack and disconnected my Elecraft KX3 from the KXPA100 amp in the shack.

My pre-side rails KX3 in the shack.

My KX3 is used a lot in the shack–along with the Mission RGO One and Ten-Tec Argonaut V–it’s one of my staple rigs at the QTH. I didn’t think I would have time to complete an activation on this quick trip, but if I did, I wanted to use the KX3. I also grabbed one of my pouches that contained a 12V battery, distribution panel, and power cord.

Also inside the pack was my Elecraft KX2 kit. It was in there from a previous activation, so I just left it in the bag.

When a window of opportunity for a quick activation opened on Friday, April 8, 2022, I grabbed it. I didn’t have time to go far afield, so I chose to activate the closest park to where I was running errands that day.

Fort Dobbs State Historic Site (K-6839)

As I was driving to the site on I-40, it dawned on my that I might have forgotten to pack an antenna.

Not a good feeling, but I was only 10 minutes from the park, so there was no turning back.

You see, a couple days beforehand, I did a bit of an antenna inventory at the QTH–I took all of my antennas out of their packs, checked them over carefully for any damage or fault points and  made notes.

I normally keep a 20M EFHW antenna in my KX2 field kit, but I remembered that also I removed it during the inventory.

Once I arrived at Fort Dobbs, I opened my SOTA pack and confirmed that I had no antenna. Not a one.

I kept a clear head and realized that if I wanted to complete the activation, I needed to do one of two things:

  1. Search the car in case, somehow, I had a spare antenna floating around in there. Unlikely, but I’d feel like a fool if I aborted an activation with an antenna in the car.
  2. Go to a nearby hardware or dollar store and find some cheap wire.  The KX3 has a brilliant internal ATU to match pretty much any wire I connect to it.

So, I searched the car. Continue reading QRP POTA at Fort Dobbs: No antenna? No problem! →

Articles, Comparisons, Morse Code, News, Portable, QRP Radios, Reviews

Which to choose? The Venus SW-3B or the Penntek TR-35?

34 Comments

Many thanks to Pat (N0HR) who shared following question in a comment:

Thomas

I simply love your videos – both your impressions of the gear and the activations themselves. Great stuff.

I’m curious – now that you’ve played with both the SW-3B and the Penntek TR-35, which is the favorite? Seems like they’re both roughly in the same price range.

Thanks for your fantastic channel and website

73,
Pat N0HR

Thank you for the kind words, Pat, and great question! Several people have asked me variations of this very question recently.

I like both radios, so I’ll frame this in a way that might help others make a purchase decision.

Spoiler alert: You really can’t go wrong with either radio and I feel it’s more a question of operator preferences. Continue reading Which to choose? The Venus SW-3B or the Penntek TR-35? →

News, Portable, QRP

Dale’s 3D printed portable transceiver knee board

13 Comments

Many thanks to Dale (W7HLO) who writes:

Hello Thomas,

My wife decided this winter that she would like to see me playing radio outdoors rather than in the shack during the summer months so graciously purchased a KX2 for me for Christmas. During the long wait for it to arrive I think I read most everything on your blog about 3 times. I noticed in several of your postings that you were using a folding lap desk designed and printed by CarolAnne N0RNM.

Her design inspired me so I designed a copy cat of sorts. I wanted mine to be slightly larger so it ended up being 8.5” wide and 14” high when unfolded. 8.5 X 7 when folded up. Like CarolAnne’s it has the same recessed area to attach a sticky pad and I added cutouts in which to put a leg strap.

Now if the weather would only improve so I can go do my first SOTA and POTA activations.

If anyone would like to print one of these lap boards for themselves I have put the files up here: https://www.thingiverse.com/thing:5320260

72

Dale / W7HLO

Very cool, Dale! I love it. 

And, wow! Your wife purchased you a KX2 for Christmas? She’s a keeper indeed! 🙂

By the way, loads of people have asked me about the N0RNM kneeboard and I believe within the next couple of months it may be available for purchase. This would be convenient, of course, for those without a 3D printer at home.

I’ll certainly post an announcement here on QRPer.com when it available. 

Again, Dale, thank you for sharing your project! 

News

Our radio astronomy weekend at PARI

19 Comments

Something you may not know about me: I’m a bit of a radio astronomy nut.

We’re pretty lucky here in western North Carolina to live within a reasonable drive of the Pisgah Astronomical Research Institute (PARI).

PARI started out life as a NASA tracking station during the Apollo era, then eventually became a Department of Defense facility. In the 1990s, the DOD left the site and a non-profit was formed to turn the observatory into an educational and research institute. They’ve a number of radio  telescopes and even a few optical telescopes. They’re also home to the Astronomical Photographic Data Archive and a number of other projects.

My family–including my then very young daughters–volunteered at PARI for quite a few years. We were actively involved in their Sci Girls program, I’ve given presentations about SDRs and HF at a couple of their monthly events, we volunteered during their massive solar eclipse gathering, and even hosted a weekend SWL DXpedition in 2015.

The campus is simply amazing.

Due to funding, staff and programs were downsized starting around 2019 and we lost touch during the Covid era when the campus was locked down.

This past weekend, PARI held an open house, though, and it was incredibly fun heading back to the campus and reconnecting with a few of our friends there.

My daughter and I snapped some random photos. I discovered them this morning and thought I’d share them in case there are other radio astronomy nuts out there in the QRPer community (click to enlarge these):

When my daughters were only eight years old, they were allowed to steer the 26 meter dish in the photo directly above. I wasn’t a bit jealous at all! No, not me! ?

As QRP as I am, I absolutely love gazing at these massive radio telescopes. Perhaps it’s because I know they’re working some serious weak signal DX and peering into our past to unveil some mind-blowing science!

Click here to read more about PARI.

Field Reports, New Products, News, Portable, POTA, QRP, QRP Radios

My first POTA activation with the Mountain Topper MTR-4B V2

13 Comments

As you might have noticed from past field reports, I’m a big fan of the LnR Precision Mountain Topper MTR-3B. It’s a wee CW-only transceiver that is almost perfectly designed for summit and park activating. It’s so lightweight and compact, you barely notice it in your backpack.

Thing is, the MTR-3B is no longer produced and I’m not sure if it ever will be again, but Steve Weber (KD1JB) hasn’t stopped making iterative improvements to the Mountain Topper design and LnR hasn’t stopped producing them.

In late 2020, LnR introduced the new MTR-4B which replaced the MTR-3B and added a few extra features that many of us had been asking for including:

  • Easy access to sidetone volume control (with a dielectric screwdriver)
  • A built-in SWR meter
  • A wider voltage range and higher output power (up to 5 watts)
  • And the 80 meter band in addition to 40, 30, and 20 meters

The MTR-4B also has an attractive red gloss chassis.

And the right and left sides of the chassis even protrude a bit to better protect the front panel buttons and switches when the unit is flipped over on its face. Nice touch!

Generosity

One of the great things about being me is I am often at the receiving end of incredibly generous people who like supporting what I do.

QRPer.com is a pure labor of love and I’d do what I do without any compensation, but it’s an honor when anyone goes out of their way to thank or support me.

Seriously: the kindness I feel here restores my faith in humanity.

In January, a reader (who wishes to remain anonymous) approached me with a deal I simply couldn’t refuse. He is a very seasoned and accomplished field operator but has only recently been upping his CW game. I believe as a reward to himself for starting CW activations later this year, he told me he wished to order a new MTR-4B.

What he proposed was to purchase the radio from LnR and have it drop-shipped to me. He wanted me to have the opportunity to review this little radio and log field time with it as well. He told me I could use it for months before shipping it to him and not to worry about it getting scratched or showing other signs of field use.

Wow.

I loved this idea because, as a reviewer, it isn’t financially viable to buy each and every radio I would like to review. I do like asking manufacturers for loaner radios, but LnR is a small manufacturer and make these units to order. I know them quite well and they simply don’t have extra loaner units lying around the shop–much like new automobiles these day, each one produced is already spoken for.

I accepted his offer with gratitude. I looked forward to getting my hands on the MTR-4B!

But that wasn’t all: this kind reader has actually been sending me coffee fund contributions that will add up to half the price of a new MTR-4B should I decide to purchase and add one to my own field radio arsenal! I tried, but I couldn’t talk him out of it.

So there you go. I’m so incredibly grateful.

Delivery

As LnR Precision states on their website, there’s roughly a 6-8 week lead time on the MTR-4B. I took delivery of this unit in early March.

As with all LnR Precision products, it was packed amazingly well.

I wasn’t sure what to expect in terms of size, but the MTR-3B is only slightly bulkier than the MTR-3B (indeed, in my activation video below, I compare the two).

I love the hotrod red paint job!

This unit arrived during what turned out to be a crazy time for me–one where there was nearly a four week period with no field activations. That’s how crazy!

I did play with the MTR-4B in the shack, however, during that time and logged numerous POTA, WWFF, and SOTA activators. I even had a couple of 80 meter rag chews.

Many field ops were surprised that the MTR-4B didn’t use the forth band position for 17 or 15 meters and I tend to agree. In the field, efficient 80 meter antennas are a bit bulky for the likes of a summit activator. Then again, when in the shack or for extended camping trips? I find 80 meters a brilliant band for evening rag chews and late night DXing.

Not sure how much I’ll use 80M in the field, but I do appreciate this additional band!

Of course, the MTR-4B is built for playing radio outdoors and that’s exactly what I had in store for it on April 13, 2022. Continue reading My first POTA activation with the Mountain Topper MTR-4B V2 →

Articles, News, Portable, Portable Power, POTA, QRP, QRP Radios

A little off-grid radio and offline camping!

16 Comments

If you were hunting POTA contacts last week, you might have seen my callsign pop up in the spots quite a few times at New River State Park (K-2748).

Morning reading along with a proper brew in my C.R.A.Q. coffee mug!

Our family decided to take a little break from everything–including the internet–and simply enjoy the great outdoors and a little camping in our small travel trailer (caravan).

Our ferocious guard dog protecting the camp site from hostile invaders. Note that she’s actually awake and alert. A rarity indeed!

It was amazing fun.

In terms of radios, I limited myself to two. While we had room for more, I decided in advance I wanted to spend some proper bonding time with my Yaesu FT-817ND.

I’m so glad I did.

I also brought the Elecraft KX2 but primarily planned to use it when operating off-site. This way, I could keep the FT-817ND system hooked up and ready for action at our camp site.

In fact, the KX2 remained in my SOTA pack for the duration of the trip as a grab-and-go. I had an absolute blast with it activating the summit of Mount Jefferson.

Solar power

This camping trip gave me an excuse to use a station accessory I purchased last year: my Buddipole Powermini 2.

The Powermini 2 is a very compact and capable charge controller with an input for solar panels, a battery, two DC outputs, and even a USB power output. A genius little device.

I’ve been asked a number of times why I don’t do solar charging in the field during my activations. There are a few reasons, actually:

  • First of all, my activations tend to be short in duration–perhaps 45 to 75 minutes. I could easily operate for a few hours on one battery charge with most of my QRP radios. In other words, I rarely need to recharge in the field.
  • Often, my field activation sites are shaded by choice. Since I like to hang wires in trees, those same trees would block sunlight from ever hitting my panels.
  • Finally, unless I’m testing a new radio, I tend to take the least amount of accessories necessary to complete the activation. This is especially the case with SOTA activations. Since I’m unlikely to use solar panels, I leave them in the car or at the QTH. I do, however, keep them packed and at-the-ready should the need arise.

I paired the Powermini 2 with PowerFilm Solar folding panels I purchased many moons ago at Hamvention (I’m guessing in 2012 or so–?). These were blemished units and I snagged them for a brilliant price. Looking back, I wish I would have purchased a few more.

They’re only 5 watts each, but I run them in parallel to feed the charge controller with the equivalent of 10 watts.

QRP gear is so efficient, these modest panels actually do a respectable job keeping the battery topped off. At New River State Park it helped that our picnic table was in full sunlight most of the day.

Sure, we had shore power at the site, but where’s the fun in that?

QRM

During the week, the site had low levels of RFI/QRM. That all changed during the weekend when new campers moved in along with their leaky switching power supplies and noisy inverters.

On Saturday, I found it too frustrating to try making contacts from the campsite–the noise floor was a steady S7 with peaks around S9 simply washing over all but the strongest signals. I regretted not packing my Chameleon loop antenna.

Instead of fighting the QRM, I abandoned it. I drove to a large isolated picnic shelter at New River and set up the KX2 and CHA MPAS Lite antenna.

The site was noise-free and I had amazing fun.

Videos

I made quite a few activation videos, so I’ll eventually post them with abbreviated field reports.

Frankly, I am still catching up from having been offline so long.

Thank you

Massive thanks to my good friend Eric (WD8RIF) who took care of QRPer.com while I was gone. He’s been moderating comments and making sure scheduled posts published properly. In fact, my friend Robert Gulley (K4PKM) was holding down the fort over on the SWLing Post too. I’m so thankful to both of them.

Also, many thanks to all of the hunters who worked me on multiple bands and in multiple modes. A special shot out to NE4TN who was a life saver and spotted me on several occasions when the connection between the POTA site and Reverse Beacon Network were down. Many thanks, OM!

Of course, I’d also like to send a special thanks to those of you who have been supporting the site and channel through Patreon and the Coffee Fund. While certainly not a requirement as my content will always be free, I really appreciate the support. Your support actually helps to make radio fun like this possible.

Here’s wishing everyone an amazing weekend!

Cheers & 72,

Thomas (K4SWL)

Field Radio Kits, Grab And Go, News, Portable, QRP, QRP Radios

Jim’s Icom IC-705 travel kit housed in a Nanuk 915 rugged waterproof case

7 Comments

Recently, I was in in touch with Jim (WA7VFQ) who was trying to decide which radio to take on a vacation to the North Carolina coast. He replied with details about the field kit he put together for the trip which will require air travel. Jim writes:

Last year in one of your QRPer posts you mentioned your search for a case for one of you radios. I commented that I had a Nanuk case that I liked and promised pictures.

Well, we are finally there!

It wasn’t until yesterday that I decided to take my Icom IC-705 over my Elecraft KX3 [on vacation]. I had new foam for the case and last night I did my “foam plucking” and I’m pleased with the outcome. I had a couple of Icom decals and since it wasn’t the Elecraft, one of them wound up on the exterior. Some guy on the internet was touting the Tom Bihn Travel Trays; we have 4 on them, 3 large and one small. All are headed to NC with us. One of them will carry my extra radio gear.

The Nanuk 915 (above) houses the Icom IC-705 (with cage), a RigExpert 230 Stick analyzer, Bioenno 4.5 Ah battery and Mat 705 Plus ATU. Continue reading Jim’s Icom IC-705 travel kit housed in a Nanuk 915 rugged waterproof case →

Field Reports, Kits, Morse Code, New Products, News, Portable, QRP, QRP Radios, Videos

Field Report: My first POTA activation with the Penntek TR-35

16 Comments

My most recent field report and video featured the Penntek TR-35 but it was not my first activation with this fantastic little QRP rig!

I pushed the last field report and activation video to the front of the line so that I could show how CW message memory keying worked in the TR-35’s updated firmware. It was, in my opinion, a major upgrade!

What follows is my field report from April 1, 2022: my first POTA activation with the Penntek TR-35. This video was made a week or so before I learned that WA3RNC was working on the new firmware.

Side note: If you’d like to read my full review of the TR-35, check out the May 2022 issue of The Spectrum Monitor magazine.

Although I’d used the TR-35 in the shack for more than a month I was eager to find an opportunity to take it to the field. April 1, 2022 was that day and I made a little detour to one of my favorite local POTA sites to break in the TR-35… Continue reading Field Report: My first POTA activation with the Penntek TR-35 →

Morse Code, News, Portable, QRP, QRP Radios, Reviews, Software Defined Radio, SSB

A review of the Xiegu X6100 portable SDR transceiver

24 Comments

The following article originally appeared in the April 2022 issue of The Spectrum Monitor magazine:

A review of the Xiegu X6100 portable SDR transceiver

by Thomas (K4SWL)

Do you remember when band scopes and spectrum displays started appearing on radios?  It was a pretty phenomenal innovation. Being able to “see” what was in your neighborhood on a particular radio band was incredibly useful, especially to operators who like to hunt stations, and to DXers who wanted to follow the reply pattern of DX stations running split. Spectrum displays, among other things, gave operators an overall “big picture” of band activity, and it was truly insightful.

Additionally, the advent of SDR (software-defined radio) architecture made not only spectrum displays but also time-based waterfall displays accessible in radios of all price ranges.

From the perspective of both a ham radio operator and a shortwave radio listener, I can tell you that once you become accustomed to the benefits of a spectrum display, when you don’t have one, you feel like you’re cruising the band wearing blinders:  it’s just that essential.

As a result, many hams and SWLs have come to rely on these features. No doubt customer demand has pushed manufacturers to include spectrum displays on almost all new SDR-based transceivers––even portable transceivers!

Enter the X6100

In November 2021, China-based radio manufacturer, Xiegu, started shipping their latest SDR transceiver: the Xiegu X6100.

Xiegu has become quite a household name among HF field operators.  I’ve reviewed both the Xiegu G90 and the Xiegu X5105. The common theme is their affordability, portability, superb built-in ATUs, and impressive feature set. Admittedly, high-end performance––in terms of receiver as well as audio performance––is not their strong suit, but in the field you don’t necessarily need contest-grade performance. I’ve found that both the G90 and X5105 are quite effective and adept in the field and at home. Many a new ham operator has turned to Xiegu products to begin their foray into the world of HF.

Judging by appearance alone, you can tell that Xiegu was targeting the same operators who might consider the Icom IC-705. Cosmetically it’s strikingly similar in terms of knob, screen, and button placement on the front panel.

The X6100 also has Bluetooth and WiFi connectivity, like the IC-705: a first for the sub-$1,000 portable radio market. But unlike the IC-705, this functionality was not in place with the first production run of the X6100. It’s being slowly implemented via X6100 firmware updates.

But in my view, that’s where the similarities with the IC-705 stop. Based on the announced X6100 specifications, I could tell well before the X6100’s release that it would lack many of the features that make the IC-705 such a hit; features like a touch screen, D-star mode, VHF/UHF multimode, built-in GPS, built-in D-Star, built-in repeater directories that can auto-load the repeaters closest to the operator, advanced filter shaping, and so much more.

But the X6100 and IC-705 share enough similarities that field-portable HF enthusiasts have taken notice…Nonetheless, it’s one major difference that has really caught their attention. Continue reading A review of the Xiegu X6100 portable SDR transceiver →